menu
Menu Interaction Function
menu
presents the user with a menu of choices labelled from 1
to the number of choices. To exit without choosing an item one can
select 0.
- Keywords
- utilities, programming
Usage
menu(choices, graphics = FALSE, title = NULL)
Arguments
- choices
- a character vector of choices
- graphics
- a logical indicating whether a graphics menu should be used if available.
- title
- a character string to be used as the title of the menu.
NULL
is also accepted.
Details
If graphics = TRUE
and a windowing system is available
(Windows, OS X or X11 via Tcl/Tk) a listbox widget is
used, otherwise a text menu. It is an error to use menu
in a
non-interactive session.
Ten or fewer items will be displayed in a single column, more in multiple columns if possible within the current display width.
No title is displayed if title
is NULL
or ""
.
Value
- The number corresponding to the selected item, or 0 if no choice was made.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
select.list
, which is used to implement the graphical
menu, and allows multiple selections.
Examples
library(utils)
switch(menu(c("List letters", "List LETTERS")) + 1,
cat("Nothing done\n"), letters, LETTERS)
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